From 93c0dfd1d7b97bff8caaec761aecca4a929c3412 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sun, 24 Feb 2019 15:19:32 +0100
Subject: [PATCH] LibC: A bunch of compat work towards porting GCC.

---
 LibC/Makefile        |  2 ++
 LibC/ctype.h         | 24 ++++++++++++++++++++++++
 LibC/errno_numbers.h |  5 +++--
 LibC/stdint.h        | 26 +++++++++++++++++++++++++-
 LibC/stdio.cpp       |  8 ++++++++
 LibC/stdio.h         |  3 +++
 LibC/stdlib.cpp      | 20 ++++++++++++++++++++
 LibC/stdlib.h        |  2 ++
 LibC/string.cpp      |  4 ++--
 LibC/strings.cpp     | 16 ++++++++++++++++
 LibC/strings.h       | 11 +++++++++++
 LibC/sys/cdefs.h     |  2 +-
 LibC/sys/types.h     | 14 +++++++-------
 LibC/sys/wait.cpp    | 12 ++++++++++++
 LibC/sys/wait.h      | 10 ++++++++++
 LibC/time.cpp        |  6 ++++++
 LibC/time.h          |  2 ++
 LibC/wchar.h         | 12 ++++++++++++
 18 files changed, 166 insertions(+), 13 deletions(-)
 create mode 100644 LibC/strings.cpp
 create mode 100644 LibC/strings.h
 create mode 100644 LibC/sys/wait.cpp

diff --git a/LibC/Makefile b/LibC/Makefile
index 1bc12669c83..51ce5486609 100644
--- a/LibC/Makefile
+++ b/LibC/Makefile
@@ -10,6 +10,7 @@ LIBC_OBJS = \
        stdio.o \
        unistd.o \
        string.o \
+       strings.o \
        mman.o \
        dirent.o \
        stdlib.o \
@@ -35,6 +36,7 @@ LIBC_OBJS = \
        utime.o \
        sys/select.o \
        sys/socket.o \
+       sys/wait.o \
        poll.o \
        locale.o \
        crt0.o
diff --git a/LibC/ctype.h b/LibC/ctype.h
index b55860d3088..cfd0cbefec4 100644
--- a/LibC/ctype.h
+++ b/LibC/ctype.h
@@ -70,6 +70,28 @@ ALWAYS_INLINE int __iscntrl(int c)
     return (c >= 0 && c <= 0x1f) || c == 0x7f;
 }
 
+ALWAYS_INLINE int __isxdigit(int c)
+{
+    return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
+}
+
+#ifdef __cplusplus
+#define __CTYPE_FUNC(name) static inline int name(int c) { return __ ## name(c); }
+
+__CTYPE_FUNC(isascii)
+__CTYPE_FUNC(isspace)
+__CTYPE_FUNC(islower)
+__CTYPE_FUNC(isupper)
+__CTYPE_FUNC(tolower)
+__CTYPE_FUNC(toupper)
+__CTYPE_FUNC(isdigit)
+__CTYPE_FUNC(ispunct)
+__CTYPE_FUNC(isprint)
+__CTYPE_FUNC(isalpha)
+__CTYPE_FUNC(isalnum)
+__CTYPE_FUNC(iscntrl)
+__CTYPE_FUNC(isxdigit)
+#else
 #define isascii(c) __isascii(c)
 #define isspace(c) __isspace(c)
 #define islower(c) __islower(c)
@@ -82,5 +104,7 @@ ALWAYS_INLINE int __iscntrl(int c)
 #define isalpha(c) __isalpha(c)
 #define isalnum(c) __isalnum(c)
 #define iscntrl(c) __iscntrl(c)
+#define isxdigit(c) __isxdigit(c)
+#endif
 
 __END_DECLS
diff --git a/LibC/errno_numbers.h b/LibC/errno_numbers.h
index 99fff5337a9..2aa31f0afff 100644
--- a/LibC/errno_numbers.h
+++ b/LibC/errno_numbers.h
@@ -46,14 +46,15 @@
     __ERROR(EADDRINUSE,     "Address in use") \
     __ERROR(EWHYTHO,        "Failed without setting an error code (Bug!)") \
     __ERROR(ENOTEMPTY,      "Directory not empty") \
+    __ERROR(EDOM,           "Math argument out of domain") \
     __ERROR(ECONNREFUSED,   "Connection refused") \
     __ERROR(EMAXERRNO,      "The highest errno +1 :^)")
 
 
 enum __errno_values {
-#undef __ERROR
+#undef __ENUMERATE_ERROR
 #define __ERROR(a, b) a,
     __ENUMERATE_ALL_ERRORS
-#undef __ERROR
+#undef __ENUMERATE_ERROR
     __errno_count
 };
diff --git a/LibC/stdint.h b/LibC/stdint.h
index 4ff57745bed..e2499208a16 100644
--- a/LibC/stdint.h
+++ b/LibC/stdint.h
@@ -14,7 +14,28 @@ typedef signed int int32_t;
 typedef signed short int16_t;
 typedef signed char int8_t;
 
-typedef uint32_t uintptr_t;
+#define __int8_t_defined 1
+#define __uint8_t_defined 1
+#define __int16_t_defined 1
+#define __uint16_t_defined 1
+#define __int32_t_defined 1
+#define __uint32_t_defined 1
+#define __int64_t_defined 1
+#define __uint64_t_defined 1
+
+typedef __PTRDIFF_TYPE__ uintptr_t;
+typedef __PTRDIFF_TYPE__ intptr_t;
+#define INTPTR_MAX PTRDIFF_MAX
+#define INTPTR_MIN PTRDIFF_MIN
+#define UINTPTR_MAX __UINTPTR_MAX__
+
+typedef __UINTMAX_TYPE__ uintmax_t;
+#define UINTMAX_MAX __UINTMAX_MAX__
+#define UINTMAX_MIN __UINTMAX_MIN__
+
+typedef __INTMAX_TYPE__ intmax_t;
+#define INTMAX_MAX __INTMAX_MAX__
+#define INTMAX_MIN (-INTMAX_MAX - 1)
 
 #define INT8_MIN (-128)
 #define INT16_MIN (-32767-1)
@@ -26,5 +47,8 @@ typedef uint32_t uintptr_t;
 #define UINT16_MAX (65535)
 #define UINT32_MAX (4294967295U)
 
+#define INT64_C(x)  x##LL
+#define UINT64_C(x) x##ULL
+
 __END_DECLS
 
diff --git a/LibC/stdio.cpp b/LibC/stdio.cpp
index ceb4f870951..c45a84b0782 100644
--- a/LibC/stdio.cpp
+++ b/LibC/stdio.cpp
@@ -355,6 +355,14 @@ FILE* fopen(const char* pathname, const char* mode)
     return make_FILE(fd);
 }
 
+FILE* freopen(const char* pathname, const char* mode, FILE* stream)
+{
+    (void)pathname;
+    (void)mode;
+    (void)stream;
+    assert(false);
+}
+
 FILE* fdopen(int fd, const char* mode)
 {
     assert(!strcmp(mode, "r") || !strcmp(mode, "rb"));
diff --git a/LibC/stdio.h b/LibC/stdio.h
index fac01d731b2..a5cb1ce60ef 100644
--- a/LibC/stdio.h
+++ b/LibC/stdio.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#define _STDIO_H // Make GMP believe we exist.
+
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <stdarg.h>
@@ -36,6 +38,7 @@ extern FILE* stdout;
 extern FILE* stderr;
 
 char* fgets(char* buffer, int size, FILE*);
+int fputc(int ch, FILE*);
 int fileno(FILE*);
 int fgetc(FILE*);
 int getc(FILE*);
diff --git a/LibC/stdlib.cpp b/LibC/stdlib.cpp
index 359c9f62a36..f9e425d6dda 100644
--- a/LibC/stdlib.cpp
+++ b/LibC/stdlib.cpp
@@ -309,4 +309,24 @@ size_t mbstowcs(wchar_t*, const char*, size_t)
     assert(false);
 }
 
+int atexit(void (*function)())
+{
+    (void)function;
+    assert(false);
+}
+
+long strtol(const char*, char** endptr, int base)
+{
+    (void)endptr;
+    (void)base;
+    assert(false);
+}
+
+unsigned long strtoul(const char*, char** endptr, int base)
+{
+    (void)endptr;
+    (void)base;
+    assert(false);
+}
+
 }
diff --git a/LibC/stdlib.h b/LibC/stdlib.h
index efca85b68cb..daa9d27c35a 100644
--- a/LibC/stdlib.h
+++ b/LibC/stdlib.h
@@ -16,6 +16,8 @@ void* realloc(void *ptr, size_t);
 char* getenv(const char* name);
 int atoi(const char*);
 long atol(const char*);
+long strtol(const char*, char** endptr, int base);
+unsigned long strtoul(const char*, char** endptr, int base);
 void qsort(void* base, size_t nmemb, size_t size, int (*compar)(const void *, const void *));
 __attribute__((noreturn)) void exit(int status);
 __attribute__((noreturn)) void abort();
diff --git a/LibC/string.cpp b/LibC/string.cpp
index e56c5498cb0..c1651d6c698 100644
--- a/LibC/string.cpp
+++ b/LibC/string.cpp
@@ -247,11 +247,11 @@ const char* sys_errlist[] = {
     __ENUMERATE_ALL_ERRORS
 #undef __ERROR
 };
-int sys_nerr = __errno_count;
+int sys_nerr = EMAXERRNO;
 
 char* strerror(int errnum)
 {
-    if (errnum >= __errno_count) {
+    if (errnum >= EMAXERRNO) {
         printf("strerror() missing string for errnum=%d\n", errnum);
         return const_cast<char*>("Unknown error");
     }
diff --git a/LibC/strings.cpp b/LibC/strings.cpp
new file mode 100644
index 00000000000..27d4b8135c5
--- /dev/null
+++ b/LibC/strings.cpp
@@ -0,0 +1,16 @@
+#include <strings.h>
+#include <assert.h>
+
+extern "C" {
+
+int strcasecmp(const char*, const char*)
+{
+    assert(false);
+}
+
+int strncasecmp(const char*, const char*, size_t)
+{
+    assert(false);
+}
+
+}
diff --git a/LibC/strings.h b/LibC/strings.h
new file mode 100644
index 00000000000..b7f7d1ed5a5
--- /dev/null
+++ b/LibC/strings.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+int strcasecmp(const char*, const char*);
+int strncasecmp(const char*, const char*, size_t);
+
+__END_DECLS
diff --git a/LibC/sys/cdefs.h b/LibC/sys/cdefs.h
index 0d558557fde..f74a8541f5c 100644
--- a/LibC/sys/cdefs.h
+++ b/LibC/sys/cdefs.h
@@ -18,6 +18,6 @@
 #define offsetof(type, member) __builtin_offsetof(type, member)
 
 #ifdef __cplusplus
-extern "C" int main(int, char**);
+//extern "C" int main(int, char**);
 #endif
 
diff --git a/LibC/sys/types.h b/LibC/sys/types.h
index 6230f2177ec..92461dd409a 100644
--- a/LibC/sys/types.h
+++ b/LibC/sys/types.h
@@ -7,18 +7,18 @@ __BEGIN_DECLS
 
 typedef unsigned int u_int;
 typedef unsigned long u_long;
-typedef __PTRDIFF_TYPE__ ptrdiff_t;
-typedef unsigned long int __uintmax_t;
-typedef __uintmax_t uintmax_t;
-typedef long int __intmax_t;
-typedef __intmax_t intmax_t;
 
 typedef uint32_t uid_t;
 typedef uint32_t gid_t;
-typedef int16_t pid_t;
+
+typedef int __pid_t;
+#define pid_t __pid_t
 
 typedef __SIZE_TYPE__ size_t;
-typedef int32_t ssize_t;
+typedef int __ssize_t;
+#define ssize_t __ssize_t
+
+typedef __WINT_TYPE__ wint_t;
 
 typedef uint32_t ino_t;
 typedef int32_t off_t;
diff --git a/LibC/sys/wait.cpp b/LibC/sys/wait.cpp
new file mode 100644
index 00000000000..06825603c0f
--- /dev/null
+++ b/LibC/sys/wait.cpp
@@ -0,0 +1,12 @@
+#include <sys/wait.h>
+#include <assert.h>
+
+extern "C" {
+
+pid_t wait(int* wstatus)
+{
+    (void)wstatus;
+    assert(false);
+}
+
+}
diff --git a/LibC/sys/wait.h b/LibC/sys/wait.h
index e69de29bb2d..7311b74cd69 100644
--- a/LibC/sys/wait.h
+++ b/LibC/sys/wait.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+pid_t wait(int* wstatus);
+
+__END_DECLS
diff --git a/LibC/time.cpp b/LibC/time.cpp
index 9a6992a6665..e450fe77fc0 100644
--- a/LibC/time.cpp
+++ b/LibC/time.cpp
@@ -85,9 +85,15 @@ struct tm* localtime(const time_t* t)
 
 struct tm* gmtime(const time_t* t)
 {
+    // FIXME: This is obviously not correct. What about timezones bro?
     return localtime(t);
 }
 
+char *asctime(const struct tm*)
+{
+    assert(false);
+}
+
 size_t strftime(char *s, size_t max, const char *format, const struct tm *tm)
 {
     assert(false);
diff --git a/LibC/time.h b/LibC/time.h
index 9433f276c62..2be49e0a85a 100644
--- a/LibC/time.h
+++ b/LibC/time.h
@@ -29,9 +29,11 @@ extern int daylight;
 
 int gettimeofday(struct timeval*, struct timezone* tz);
 struct tm* localtime(const time_t*);
+struct tm *gmtime(const time_t*);
 time_t time(time_t*);
 char* ctime(const time_t*);
 void tzset();
+char *asctime(const struct tm*);
 
 #define difftime(t1,t0) (double)(t1 - t0)
 
diff --git a/LibC/wchar.h b/LibC/wchar.h
index e69de29bb2d..e46806fcc5f 100644
--- a/LibC/wchar.h
+++ b/LibC/wchar.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <sys/cdefs.h>
+#include <stddef.h>
+
+__BEGIN_DECLS
+
+#ifndef WEOF
+#define WEOF (0xffffffffu)
+#endif
+
+__END_DECLS